A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

What demands an answer, but asks no questions

Find the next number in the sequence

5 12 24 36 ?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Which digit occurred maximum times between the number 1 and 1000?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

What is the riddle which can be asked all day with a different correct answer each time.

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

What happened when the wheel was invented?